单项选择题

A．Two years.
B．Five years.
C．Three years.
D．Eight years.
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单项选择题
Why does the author give the example of the terrorist attack on Sept.11
A．To prove that human is at risk.
B．To demonstrate that mankind is more nervous than any other time.
C．To show that anxiety seldom reoccurs.
D．To indicate that anxiety is easy to arouse.
单项选择题
What can be the most suitable title of this passage
A．The Origin of Anxiety.
B．The Hazards of Anxiety.
C．Healing Anxiety.
D．Understanding Anxiety.
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